PRELIMINARY DATA SHEET
UAC 3552A
3.3.3. Other Pins
3.4. Pin Configuration
TEST (29)
VSS
Test enable. This pin is for test purposes only and must
always be connected to VSS.
TEST
VDD
VREG
DPLUS
DMINUS
RESQ
SUSPEND
SOF
VREG (26)
This pin is used to connect an external buffer capacitor
to stabilize the internal supply for the USB transceiver.
AUXEN
TRDY
33 32 31 30 29 28 27 26 25 24 23
RESQ (30)
This pin may be used to reset the chip.
NC 34
NC 35
22 GPIO 7
21 GPIO 6
20 GPIO 5
19 GPIO 4
18 NC
AUXL 36
AUXR 37
FOUTL 38
FOPL 39
FINL 40
GPIO 0 ... GPIO 7 (14,15,16,17,19,20,21,22)
These pins are configurable to be either input or output
and can be used to connect audio function keys or sig-
nalling LEDs.
UAC 3552A
17 GPIO 3
16 GPIO 2
15 GPIO 1
14 GPIO 0
13 NC
FOUTR 41
FOPR 42
FINR 43
VREF 44
SUSPEND (31)
This pin indicates that the host PC sets the USB bus to
the suspend-mode state.
12 NC
1
2
3
4
5
6
7
8
9
10 11
SOF(32)
AGNDC
NC
Start of Frame Signal. 1-ms signal that can be used for
external application circuits.
AVSS1
AVSS0
OUTL
OUTR
NC
XTO
XTI
AUXEN (33)
AVDD1
Aux enable. This pin must be connected to VSS if an
analog source is connected to the AUX input. Other-
wise connect to VDD.
AVDD0
Fig. 3–2: 44-pin PMQFP package
TRDY (23)
Test Output Pin. This pin is intended for test purposes
only and must not be connected.
Micronas
17
MICRONAS [ MICRONAS ]
